/**
 * License: www.highcharts.com/license
 * Author: Torstein Honsi, Christer Vasseng
 *
 * This module serves as a fallback for the Boost module in IE9 and IE10. Newer
 * browsers support WebGL which is faster.
 *
 * It is recommended to include this module in conditional comments targeting
 * IE9 and IE10.
 */
'use strict';
import H from '../parts/Globals.js';
import '../parts/Utilities.js';
import '../parts/Color.js';
import '../parts/Series.js';
import '../parts/Options.js';

var win = H.win,
doc = win.document,
noop = function () {},
Color = H.Color,
Series = H.Series,
seriesTypes = H.seriesTypes,
each = H.each,
extend = H.extend,
addEvent = H.addEvent,
fireEvent = H.fireEvent,
isNumber = H.isNumber,
merge = H.merge,
pick = H.pick,
wrap = H.wrap,
CHUNK_SIZE = 50000,
destroyLoadingDiv;

H.initCanvasBoost = function () {
    if (H.seriesTypes.heatmap) {
        H.wrap(H.seriesTypes.heatmap.prototype, 'drawPoints', function () {
            var ctx = this.getContext();
            if (ctx) {

                // draw the columns
                each(this.points, function (point) {
                    var plotY = point.plotY,
                    shapeArgs,
                    pointAttr;

                    if (
                        plotY !== undefined &&
                        !isNaN(plotY) &&
                        point.y !== null) {
                        shapeArgs = point.shapeArgs;

                        pointAttr = point.series.pointAttribs(point);

                        ctx.fillStyle = pointAttr.fill;
                        ctx.fillRect(
                            shapeArgs.x,
                            shapeArgs.y,
                            shapeArgs.width,
                            shapeArgs.height);
                    }
                });

                this.canvasToSVG();

            } else {
                this.chart.showLoading(
                    'Your browser doesn\'t support HTML5 canvas, <br>' +
                    'please use a modern browser');

                // Uncomment this to provide low-level (slow) support in oldIE.
                // It will cause script errors on charts with more than a few
                // thousand points.
                // arguments[0].call(this);
            }
        });
    }

    H.extend(Series.prototype, {

        /**
         * Create a hidden canvas to draw the graph on. The contents is later
         * copied over to an SVG image element.
         */
        getContext: function () {
            var chart = this.chart,
            width = chart.chartWidth,
            height = chart.chartHeight,
            targetGroup = chart.seriesGroup || this.group,
            target = this,
            ctx,
            swapXY = function (proceed, x, y, a, b, c, d) {
                proceed.call(this, y, x, a, b, c, d);
            };

            if (chart.isChartSeriesBoosting()) {
                target = chart;
                targetGroup = chart.seriesGroup;
            }

            ctx = target.ctx;

            if (!target.canvas) {
                target.canvas = doc.createElement('canvas');

                target.renderTarget = chart.renderer.image(
                        '',
                        0,
                        0,
                        width,
                        height)
                    .addClass('highcharts-boost-canvas')
                    .add(targetGroup);

                target.ctx = ctx = target.canvas.getContext('2d');

                if (chart.inverted) {
                    each(['moveTo', 'lineTo', 'rect', 'arc'], function (fn) {
                        wrap(ctx, fn, swapXY);
                    });
                }

                target.boostCopy = function () {
                    target.renderTarget.attr({
                        href: target.canvas.toDataURL('image/png')
                    });
                };

                target.boostClear = function () {
                    ctx.clearRect(
                        0,
                        0,
                        target.canvas.width,
                        target.canvas.height);

                    if (target === this) {
                        target.renderTarget.attr({
                            href: ''
                        });
                    }
                };

                target.boostClipRect = chart.renderer.clipRect();

                target.renderTarget.clip(target.boostClipRect);

            } else if (!(target instanceof H.Chart)) {
                // ctx.clearRect(0, 0, width, height);
            }

            if (target.canvas.width !== width) {
                target.canvas.width = width;
            }

            if (target.canvas.height !== height) {
                target.canvas.height = height;
            }

            target.renderTarget.attr({
                x: 0,
                y: 0,
                width: width,
                height: height,
                style: 'pointer-events: none',
                href: ''
            });

            target.boostClipRect.attr(chart.getBoostClipRect(target));

            return ctx;
        },

        /**
         * Draw the canvas image inside an SVG image
         */
        canvasToSVG: function () {
            if (!this.chart.isChartSeriesBoosting()) {
                if (this.boostCopy || this.chart.boostCopy) {
                    (this.boostCopy || this.chart.boostCopy)();
                }
            } else {
                if (this.boostClear) {
                    this.boostClear();
                }
            }
        },

        cvsLineTo: function (ctx, clientX, plotY) {
            ctx.lineTo(clientX, plotY);
        },

        renderCanvas: function () {
            var series = this,
            options = series.options,
            chart = series.chart,
            xAxis = this.xAxis,
            yAxis = this.yAxis,
            activeBoostSettings = chart.options.boost || {},
            boostSettings = {
                timeRendering: activeBoostSettings.timeRendering || false,
                timeSeriesProcessing:
                activeBoostSettings.timeSeriesProcessing || false,
                timeSetup: activeBoostSettings.timeSetup || false
            },
            ctx,
            c = 0,
            xData = series.processedXData,
            yData = series.processedYData,
            rawData = options.data,
            xExtremes = xAxis.getExtremes(),
            xMin = xExtremes.min,
            xMax = xExtremes.max,
            yExtremes = yAxis.getExtremes(),
            yMin = yExtremes.min,
            yMax = yExtremes.max,
            pointTaken = {},
            lastClientX,
            sampling = !!series.sampling,
            points,
            r = options.marker && options.marker.radius,
            cvsDrawPoint = this.cvsDrawPoint,
            cvsLineTo = options.lineWidth ? this.cvsLineTo : false,
            cvsMarker = r && r <= 1 ?
                this.cvsMarkerSquare :
                this.cvsMarkerCircle,
            strokeBatch = this.cvsStrokeBatch || 1000,
            enableMouseTracking = options.enableMouseTracking !== false,
            lastPoint,
            threshold = options.threshold,
            yBottom = yAxis.getThreshold(threshold),
            hasThreshold = isNumber(threshold),
            translatedThreshold = yBottom,
            doFill = this.fill,
            isRange = series.pointArrayMap &&
                series.pointArrayMap.join(',') === 'low,high',
            isStacked = !!options.stacking,
            cropStart = series.cropStart || 0,
            loadingOptions = chart.options.loading,
            requireSorting = series.requireSorting,
            wasNull,
            connectNulls = options.connectNulls,
            useRaw = !xData,
            minVal,
            maxVal,
            minI,
            maxI,
            kdIndex,
            sdata = isStacked ? series.data : (xData || rawData),
            fillColor = series.fillOpacity ?
                new Color(series.color).setOpacity(
                    pick(options.fillOpacity, 0.75)).get() :
                series.color,

            stroke = function () {
                if (doFill) {
                    ctx.fillStyle = fillColor;
                    ctx.fill();
                } else {
                    ctx.strokeStyle = series.color;
                    ctx.lineWidth = options.lineWidth;
                    ctx.stroke();
                }
            },

            drawPoint = function (clientX, plotY, yBottom, i) {
                if (c === 0) {
                    ctx.beginPath();

                    if (cvsLineTo) {
                        ctx.lineJoin = 'round';
                    }
                }

                if (
                    chart.scroller &&
                    series.options.className ===
                    'highcharts-navigator-series') {
                    plotY += chart.scroller.top;
                    if (yBottom) {
                        yBottom += chart.scroller.top;
                    }
                } else {
                    plotY += chart.plotTop;
                }

                clientX += chart.plotLeft;

                if (wasNull) {
                    ctx.moveTo(clientX, plotY);
                } else {
                    if (cvsDrawPoint) {
                        cvsDrawPoint(
                            ctx,
                            clientX,
                            plotY,
                            yBottom,
                            lastPoint);
                    } else if (cvsLineTo) {
                        cvsLineTo(ctx, clientX, plotY);
                    } else if (cvsMarker) {
                        cvsMarker.call(series, ctx, clientX, plotY, r, i);
                    }
                }

                // We need to stroke the line for every 1000 pixels. It will
                // crash the browser memory use if we stroke too
                // infrequently.
                c = c + 1;
                if (c === strokeBatch) {
                    stroke();
                    c = 0;
                }

                // Area charts need to keep track of the last point
                lastPoint = {
                    clientX: clientX,
                    plotY: plotY,
                    yBottom: yBottom
                };
            },

            addKDPoint = function (clientX, plotY, i) {
                // Avoid more string concatination than required
                kdIndex = clientX + ',' + plotY;

                // The k-d tree requires series points. Reduce the amount of
                // points, since the time to build the tree increases
                // exponentially.
                if (enableMouseTracking && !pointTaken[kdIndex]) {
                    pointTaken[kdIndex] = true;

                    if (chart.inverted) {
                        clientX = xAxis.len - clientX;
                        plotY = yAxis.len - plotY;
                    }

                    points.push({
                        clientX: clientX,
                        plotX: clientX,
                        plotY: plotY,
                        i: cropStart + i
                    });
                }
            };

            if (this.renderTarget) {
                this.renderTarget.attr({
                    'href': ''
                });
            }

            // If we are zooming out from SVG mode, destroy the graphics
            if (this.points || this.graph) {
                this.destroyGraphics();
            }

            // The group
            series.plotGroup(
                'group',
                'series',
                series.visible ? 'visible' : 'hidden',
                options.zIndex,
                chart.seriesGroup);

            series.markerGroup = series.group;
            addEvent(series, 'destroy', function () { // Prevent destroy twice
                series.markerGroup = null;
            });

            points = this.points = [];
            ctx = this.getContext();
            series.buildKDTree = noop; // Do not start building while drawing

            if (this.boostClear) {
                this.boostClear();
            }

            // if (this.canvas) {
            //     ctx.clearRect(
            //         0,
            //         0,
            //         this.canvas.width,
            //         this.canvas.height
            //     );
            // }

            if (!this.visible) {
                return;
            }

            // Display a loading indicator
            if (rawData.length > 99999) {
                chart.options.loading = merge(loadingOptions, {
                        labelStyle: {
                            backgroundColor: H.color('#ffffff')
                            .setOpacity(0.75).get(),
                            padding: '1em',
                            borderRadius: '0.5em'
                        },
                        style: {
                            backgroundColor: 'none',
                            opacity: 1
                        }
                    });
                H.clearTimeout(destroyLoadingDiv);
                chart.showLoading('Drawing...');
                chart.options.loading = loadingOptions; // reset
            }

            if (boostSettings.timeRendering) {
                console.time('canvas rendering'); // eslint-disable-line no-console
            }

            // Loop over the points
            H.eachAsync(sdata, function (d, i) {
                var x,
                y,
                clientX,
                plotY,
                isNull,
                low,
                isNextInside = false,
                isPrevInside = false,
                nx = false,
                px = false,
                chartDestroyed = typeof chart.index === 'undefined',
                isYInside = true;

                if (!chartDestroyed) {
                    if (useRaw) {
                        x = d[0];
                        y = d[1];

                        if (sdata[i + 1]) {
                            nx = sdata[i + 1][0];
                        }

                        if (sdata[i - 1]) {
                            px = sdata[i - 1][0];
                        }
                    } else {
                        x = d;
                        y = yData[i];

                        if (sdata[i + 1]) {
                            nx = sdata[i + 1];
                        }

                        if (sdata[i - 1]) {
                            px = sdata[i - 1];
                        }
                    }

                    if (nx && nx >= xMin && nx <= xMax) {
                        isNextInside = true;
                    }

                    if (px && px >= xMin && px <= xMax) {
                        isPrevInside = true;
                    }

                    // Resolve low and high for range series
                    if (isRange) {
                        if (useRaw) {
                            y = d.slice(1, 3);
                        }
                        low = y[0];
                        y = y[1];
                    } else if (isStacked) {
                        x = d.x;
                        y = d.stackY;
                        low = y - d.y;
                    }

                    isNull = y === null;

                    // Optimize for scatter zooming
                    if (!requireSorting) {
                        isYInside = y >= yMin && y <= yMax;
                    }

                    if (!isNull &&
                        (
                            (x >= xMin && x <= xMax && isYInside) ||
                            (isNextInside || isPrevInside))) {

                        clientX = Math.round(xAxis.toPixels(x, true));

                        if (sampling) {
                            if (minI === undefined || clientX === lastClientX) {
                                if (!isRange) {
                                    low = y;
                                }
                                if (maxI === undefined || y > maxVal) {
                                    maxVal = y;
                                    maxI = i;
                                }
                                if (minI === undefined || low < minVal) {
                                    minVal = low;
                                    minI = i;
                                }

                            }
                            // Add points and reset
                            if (clientX !== lastClientX) {
                                if (minI !== undefined) { // maxI also a number
                                    plotY = yAxis.toPixels(maxVal, true);
                                    yBottom = yAxis.toPixels(minVal, true);
                                    drawPoint(
                                        clientX,
                                        hasThreshold ?
                                        Math.min(
                                            plotY,
                                            translatedThreshold) : plotY,
                                        hasThreshold ?
                                        Math.max(
                                            yBottom,
                                            translatedThreshold) : yBottom,
                                        i);
                                    addKDPoint(clientX, plotY, maxI);
                                    if (yBottom !== plotY) {
                                        addKDPoint(clientX, yBottom, minI);
                                    }
                                }

                                minI = maxI = undefined;
                                lastClientX = clientX;
                            }
                        } else {
                            plotY = Math.round(yAxis.toPixels(y, true));
                            drawPoint(clientX, plotY, yBottom, i);
                            addKDPoint(clientX, plotY, i);
                        }
                    }
                    wasNull = isNull && !connectNulls;

                    if (i % CHUNK_SIZE === 0) {
                        if (series.boostCopy || series.chart.boostCopy) {
                            (series.boostCopy || series.chart.boostCopy)();
                        }
                    }
                }

                return !chartDestroyed;
            }, function () {
                var loadingDiv = chart.loadingDiv,
                loadingShown = chart.loadingShown;
                stroke();

                // if (series.boostCopy || series.chart.boostCopy) {
                //     (series.boostCopy || series.chart.boostCopy)();
                // }

                series.canvasToSVG();

                if (boostSettings.timeRendering) {
                    console.timeEnd('canvas rendering'); // eslint-disable-line no-console
                }

                fireEvent(series, 'renderedCanvas');

                // Do not use chart.hideLoading, as it runs JS animation and
                // will be blocked by buildKDTree. CSS animation looks good, but
                // then it must be deleted in timeout. If we add the module to
                // core, change hideLoading so we can skip this block.
                if (loadingShown) {
                    extend(loadingDiv.style, {
                        transition: 'opacity 250ms',
                        opacity: 0
                    });
                    chart.loadingShown = false;
                    destroyLoadingDiv = setTimeout(function () {
                            if (loadingDiv.parentNode) { // In exporting it is falsy
                                loadingDiv.parentNode.removeChild(loadingDiv);
                            }
                            chart.loadingDiv = chart.loadingSpan = null;
                        }, 250);
                }

                // Go back to prototype, ready to build
                delete series.buildKDTree;

                series.buildKDTree();

                // Don't do async on export, the exportChart, getSVGForExport and
                // getSVG methods are not chained for it.
            }, chart.renderer.forExport ? Number.MAX_VALUE : undefined);
        }
    });

    seriesTypes.scatter.prototype.cvsMarkerCircle = function (
        ctx,
        clientX,
        plotY,
        r) {
        ctx.moveTo(clientX, plotY);
        ctx.arc(clientX, plotY, r, 0, 2 * Math.PI, false);
    };

    // Rect is twice as fast as arc, should be used for small markers
    seriesTypes.scatter.prototype.cvsMarkerSquare = function (
        ctx,
        clientX,
        plotY,
        r) {
        ctx.rect(clientX - r, plotY - r, r * 2, r * 2);
    };
    seriesTypes.scatter.prototype.fill = true;

    if (seriesTypes.bubble) {
        seriesTypes.bubble.prototype.cvsMarkerCircle = function (
            ctx,
            clientX,
            plotY,
            r,
            i) {
            ctx.moveTo(clientX, plotY);
            ctx.arc(
                clientX,
                plotY,
                this.radii && this.radii[i], 0, 2 * Math.PI,
                false);
        };
        seriesTypes.bubble.prototype.cvsStrokeBatch = 1;
    }

    extend(seriesTypes.area.prototype, {
        cvsDrawPoint: function (ctx, clientX, plotY, yBottom, lastPoint) {
            if (lastPoint && clientX !== lastPoint.clientX) {
                ctx.moveTo(lastPoint.clientX, lastPoint.yBottom);
                ctx.lineTo(lastPoint.clientX, lastPoint.plotY);
                ctx.lineTo(clientX, plotY);
                ctx.lineTo(clientX, yBottom);
            }
        },
        fill: true,
        fillOpacity: true,
        sampling: true
    });

    extend(seriesTypes.column.prototype, {
        cvsDrawPoint: function (ctx, clientX, plotY, yBottom) {
            ctx.rect(clientX - 1, plotY, 1, yBottom - plotY);
        },
        fill: true,
        sampling: true
    });

    H.Chart.prototype.callbacks.push(function (chart) {
        function canvasToSVG() {
            if (chart.boostCopy) {
                chart.boostCopy();
            }
        }

        function clear() {
            if (chart.renderTarget) {
                chart.renderTarget.attr({
                    href: ''
                });
            }

            if (chart.canvas) {
                chart.canvas.getContext('2d').clearRect(
                    0,
                    0,
                    chart.canvas.width,
                    chart.canvas.height);
            }
        }

        addEvent(chart, 'predraw', clear);
        addEvent(chart, 'render', canvasToSVG);
    });
};
